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| шарошечное долото | |||
| конусное долото | |||
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| шарошечное долото | |||
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| шарошечное долото | |||
| cone rock bit: 15 phrases in 4 subjects |
| Oil / petroleum | 7 |
| Oil and gas | 6 |
| Oil and gas technology | 1 |
| Technology | 1 |
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